An anomalous Hall effect in altermagnetic ruthenium dioxide
By Zexin Feng, Xiaorong Zhou, L. Šmejkal, Lei Wu, Zengwei Zhu, Huixin Guo, R. González-Hernández, Xiaoning Wang, Han Yan, Peixin Qin and 9 more. Nature Electronics, 2020
620 citations recorded by the source corpus.
The anomalous Hall effect is a time-reversal symmetry-breaking magneto-electronic phenomenon originally discovered in ferromagnets. Recently, ruthenium dioxide (RuO2) with a compensated antiparallel magnetic order has been predicted to generate an anomalous Hall effect of comparable strength to ferromagnets. The phenomenon arises from an altermagnetic phase of RuO2 with a characteristic alternating spin polarization in both real-space crystal structure and momentum-space band structure. Here we report an anomalous Hall effect in RuO2 with an anomalous Hall conductivity exceeding 1,000 Ω−1 cm−1. We combine the vector magnetometry and magneto-transport measurements of epitaxial RuO2 films of different crystallographic orientations. We show that the anomalous Hall effect dominates over an ordinary Hall contribution, and a contribution due to a weak field-induced magnetization. Our results could lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order. By combining vector magnetometry and magneto-transport measurements of epitaxial films with different crystallographic orientations, an anomalous Hall effect can be measured in collinear altermagnetic ruthenium dioxide with an anomalous Hall conductivity exceeding 1,000 Ω–1 cm–1.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/699a391211b28c185e75bde07ad352bf79de7a97
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Crystal-symmetry-paired spin–valley locking in a layered room-temperature metallic altermagnet candidate (2024, neutral): “As for RuO 2 , it remains controversial whether its ground state is antiferromagnetic 33,34 or non-magnetic 32 , despite evidence of an anomalous Hall effect 16,30 and spin splitting 31,38 .”
- Two-dimensional altermagnets: Superconductivity in a minimal microscopic model (2023, background): “So far, RuO 2 has been the main focus of attention [27, 28], but there are many candidate materials [2, 17, 20–22 , 29– 34].”
- Absence of magnetic order in RuO2: insights from μSR spectroscopy and neutron diffraction (2024, positive): “A plurality of experiments, in particular, have been performed on the metallic rutile oxide RuO 2 6,8,13 – 19 , where both resonant X-ray scattering 20 and neutron diffraction experiments 21 reported a q = 0 antiferromagnetic pattern that is consistent with altermagnetic symmetry constraints.”
- Altermagnetic lifting of Kramers spin degeneracy (2023, neutral): “22,38–41).”